First step towards moving v8 extensions out of WebCore. 
First step towards moving v8 extensions out of WebCore. 

Adds a registerExtension function available in our WebKit public API. 
Once this is in place, another changelist will include actually using it. 

R=mbelshe,darin


Review URL: http://codereview.chromium.org/39070

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@10868 0039d316-1c4b-4281-b951-d872f2087c98

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